Null Space Ephemeris Monitor for GBAS

J. Jing, S. Khanafseh, S. Langel, F-C. Chan, B. Pervan

Abstract:	In this paper, a new ground-based monitor is developed that instantaneously detects all types of orbit ephemeris faults in Ground Based Augmentation Systems (GBAS). Ephemeris faults result in spatial gradients that can be detected using differential GPS measurements across spatially separated ground antennas. The monitor utilizes both code and carrier phase measurements combined through a null space transformation for ephemeris fault detection. We show that the null space monitor significantly improves the detection performance over existing fault detection algorithms and provides great potential for supporting Category III precision approach and landing.
Published in:	Proceedings of the ION 2013 Pacific PNT Meeting April 23 - 25, 2013 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	978 - 985
Cite this article:	Jing, J., Khanafseh, S., Langel, S., Chan, F-C., Pervan, B., "Null Space Ephemeris Monitor for GBAS," Proceedings of the ION 2013 Pacific PNT Meeting, Honolulu, Hawaii, April 2013, pp. 978-985.
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